MRCOOL mini split systems are known for their DIY-friendly design, but one question often comes up: How much time should you actually set aside for installation? The answer depends on your system size, your home layout, and how comfortable you are with basic tools. In this guide, we break it down zone by zone, so you know exactly what to expect.
What Affects MRCOOL Installation Time?
Before jumping into the hour-by-hour estimates, let’s cover the biggest time factors:
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Number of Zones: More zones = more wall units to mount and more line sets to connect.
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Line Set Routing Complexity: Simple back-to-back installs take less time than setups that run line sets through attics, basements, or exterior siding.
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Electrical Work: Pre-installed disconnects, existing breakers, and nearby outlets can speed things up significantly.
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Mounting Surface: Installing on drywall is usually faster than brick or concrete walls.
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DIY Experience Level: Handy homeowners might finish in a day; beginners could need a weekend.
Time Estimates by System Size
1-Zone (9k–18k BTU): 2–4 Hours
The most straightforward install. These smaller systems are often used in bedrooms, garages, or home offices.
Steps:
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Mount indoor unit
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Drill 3.5″ wall hole
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Route and connect line set
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Set outdoor unit on pad or brackets
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Connect power
Pro Tip: These can often be done solo with a little prep.
2-Zone (18k–27k BTU): 4–6 Hours
With two air handlers, you’ll double some steps, but the core process remains manageable in a day.
Add-on Tasks:
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Second indoor wall unit install
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Additional line set
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Multi-zone outdoor unit hookup
Time-Saver: Use quick-connect line set extensions if you need more reach.
3-Zone (27k–36k BTU): 6–8 Hours
This size typically covers an entire floor or a small home.
Challenges:
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Wall sleeve routing for multiple zones
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Synchronizing multiple thermostat settings
Installer Tip: Label each line set during routing to avoid confusion later.
4-Zone (36k–48k BTU): 8–10 Hours
Now you’re into multi-day or advanced weekend territory. These installations benefit from at least two people working together.
Additional Time Factors:
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Finding clean routing paths for all line sets
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Possible need for support brackets and additional electrical
Plan Ahead: Start early in the day and consider leaving the line set cover installation for Day 2.
5-Zone (Up to 48k+ BTU): 10–12+ Hours
The biggest DIY setup available. While still pre-charged and DIY-friendly, these installations are better split into 2+ days unless you have help.
Tasks that Add Time:
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Coordinating five air handlers
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Routing multiple lines through attic, crawlspace, or chase
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Cable management for clean look
DIY Advice: Don’t rush. Prioritize system integrity over speed.
Tips to Speed Up the Installation Process
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Unbox Everything First: Lay out indoor and outdoor components.
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Mark Mounting Locations in Advance: Use painter's tape to map where each unit will go.
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Have a Buddy: Two people = fewer trips up the ladder and more efficient lifting.
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Pre-drill Wall Penetrations: Especially if you know the route you’ll take for line sets.
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Use Included Templates: MRCOOL provides wall brackets and hole guides.
Tools You’ll Need (and What’s Included)
Included in the Box:
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Indoor units
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Outdoor condenser
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Pre-charged quick-connect line sets
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Wall bracket and hardware
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Drain line
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Communication cable
You’ll Need to Provide:
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Drill & hole saw
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Level
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Screwdrivers
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Wrench set
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Stud finder
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Electrical tester (optional)
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Mounting pad or bracket for condenser
Should You Try to Install in One Day?
For systems with 1–2 zones, yes. For anything 3 zones and up, give yourself more time to:
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Test system pressures
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Neatly route line sets
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Ensure no communication or electrical issues
Trying to rush through a 5-zone install in one day is a recipe for fatigue and mistakes.
When to Consider Professional Help
You might want to hire an HVAC technician or licensed electrician if:
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You need a new breaker or subpanel
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Your installation involves going through brick, stucco, or multiple floors
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You’re not comfortable with voltage checks or wiring
MRCOOL DIY systems are very homeowner-friendly, but complex setups can benefit from hybrid DIY + pro help.
Final Thoughts: Plan Your Weekend Right
Installing a MRCOOL DIY mini split is one of the most empowering home upgrades you can take on—especially when you understand the time commitment by system size. Whether you're putting in a single-zone for your workshop or building out a 5-zone climate system for the whole house, planning the time investment wisely makes the process smoother, safer, and more enjoyable.
Need the right system for your home? Browse MRCOOL Mini Splits at The Furnace Outlet and get everything you need for a smooth install.
In the next topic we will know more about: Is a MRCOOL Mini Split System Right for Your Home? Pros, Cons & Use Case Scenarios
